U.S. patent application number 16/059942 was filed with the patent office on 2019-02-14 for methods on radio resource management and radio link monitoring configurations and procedures.
The applicant listed for this patent is MediaTek Inc.. Invention is credited to Hsuan-Li Lin, Tsang-Wei Yu.
Application Number | 20190052379 16/059942 |
Document ID | / |
Family ID | 65273215 |
Filed Date | 2019-02-14 |
United States Patent
Application |
20190052379 |
Kind Code |
A1 |
Lin; Hsuan-Li ; et
al. |
February 14, 2019 |
METHODS ON RADIO RESOURCE MANAGEMENT AND RADIO LINK MONITORING
CONFIGURATIONS AND PROCEDURES
Abstract
Methods on radio resource management (RRM) configurations and
procedures in wireless communication are described herein. In
particular, methods are described for providing a reference signal
strength indicator (RSSI) measurement timing configuration (RMTC).
In some embodiments, a UE may perform a RSSI measurement based on
the RMTC on at least on downlink (DL) symbol outside of a
synchronization signal (SS) block. Also described herein are
methods for inter-frequency SSB measurement, and methods for RLM
configurations and procedures.
Inventors: |
Lin; Hsuan-Li; (Hsin-Chu,
TW) ; Yu; Tsang-Wei; (Hsin-Chu, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MediaTek Inc. |
Hsin-Chu |
|
TW |
|
|
Family ID: |
65273215 |
Appl. No.: |
16/059942 |
Filed: |
August 9, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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62544136 |
Aug 11, 2017 |
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62544142 |
Aug 11, 2017 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 5/0082 20130101;
H04L 27/2611 20130101; H04W 72/0446 20130101; H04L 27/26 20130101;
H04L 5/0094 20130101; H04W 24/10 20130101; H04B 17/318 20150115;
H04L 1/0026 20130101; H04L 5/0023 20130101; H04W 56/001 20130101;
H04L 5/0048 20130101; H04L 5/0032 20130101 |
International
Class: |
H04B 17/318 20060101
H04B017/318; H04W 24/10 20060101 H04W024/10; H04W 56/00 20060101
H04W056/00; H04W 72/04 20060101 H04W072/04; H04L 1/00 20060101
H04L001/00 |
Claims
1. A method of wireless communication with a user equipment (UE),
the method comprising: identifying a reference signal strength
indicator (RSSI) measurement timing configuration (RMTC); based on
the RMTC, performing a RSSI measurement on at least one downlink
(DL) symbol outside of a synchronization signal (SS) block received
from a first cell.
2. The method of claim 1, wherein the at least one DL symbol is
within an SS burst.
3. The method of claim 1, wherein the at least one DL symbol is
outside of an SS burst.
4. The method of claim 1, wherein the RMTC is received from the
first cell.
5. The method of claim 1, wherein the RSSI measurement is an
average RSSI measurement over the at least one DL symbol.
6. The method of claim 5, further comprising receiving a plurality
of beams from the first cell, wherein the at least one DL symbol
comprises a symbol quasi-colocated (QCLed) to a beam of the
plurality of beams, and the average RSSI measurement is a
beam-level RSSI associated with the beam of the plurality of
beams.
7. The method of claim 1, wherein the RMTC comprises at least one
of: a time location of a beginning of the RSSI measurement, a
measurement duration of the RSSI measurement, and a periodicity of
two or more RSSI measurements.
8. The method of claim 1, further comprising: determining a
beginning of a measurement gap (MG) associated with a transmission
from the first cell; identifying a synchronization signal block
(SSB) measurement timing configuration (SMTC) comprising an SMTC
measurement window timing offset; beginning an SSB measurement on
an SSB received from a second cell at a time offset from the
beginning of the MG by an MG timing refinement offset, wherein the
MG timing refinement offset is less than 1 ms.
9. The method of claim 8, wherein the SSB measurement is not
performed during the MG timing refinement offset after the
beginning of the MG.
10. The method of claim 8, wherein the MG timing refinement offset
is 0.5 ms or less.
11. The method of claim 8, wherein the MG timing refinement offset
is half a slot or multiple symbols.
12. The method of claim 8, wherein the first cell has a first
frequency and the second cell has a second frequency different from
the first frequency, the method further comprising: completing a
radio frequency (RF) tuning of the UE from the first frequency to
the second frequency by the time offset from the beginning of the
MG by the MG timing refinement offset.
13. A method of wireless communication with a user equipment (UE)
for layer-3 mobility, the method comprising: identifying a timing
configuration of channel state information reference signal
(CSI-RS); based on the timing configuration, performing a radio
resource management (RRM) measurement on CSI-RS, wherein the timing
configuration comprises at least one of: a resource configuration
indicating a position of a CSI-RS time or frequency resource within
a slot, a subframe offset, and a slot offset relative to a
beginning of transmission of a synchronization signal (SS)
burst.
14. The method of claim 13, further comprising: performing cell
detection to identify a cell identification (ID); performing course
synchronization to identify a timing and frequency on SS
blocks.
15. The method of claim 14, further comprising: determining a time
index of SS blocks that is associated to the CSI-RS; determining a
timing reference based on the time index, wherein the timing
reference is a frame or slot timing determined based on the time
index of SS blocks, wherein performing the RRM measurement further
comprises performing the RRM measurement based on the timing
reference.
16. A method of wireless communication with a user equipment (UE),
the method comprising: identifying a radio link monitoring (RLM)
configuration; based on the RLM configuration, performing a
plurality of RLM measurements on a reference signal (RS), wherein
the RLM configuration comprises at least one of: a first parameter
indicating an association between the RS and a control channel, a
second parameter indicating an association between the RS and an
in-sync/out-of-synch (IS/OOS) indication.
17. The method of claim 16, wherein the first parameter comprises
at least one of: a spatial quasi-colocation (QCL), a QCL
assumption, and a control channel resource set (CONRESET)
identification.
18. The method of claim 16, wherein the control channel is a
dedicated control channel, a common control channel, or a group
common control channel.
19. The method of claim 16, further comprising: determining a radio
link quality based on the plurality of RLM measurements; comparing
the determined radio link quality with a first predefined threshold
for deriving IS indication and a second predefined threshold for
deriving OOS indication; in response to an indication that the
determined radio link quality of one of the plurality of RLM
measurements is higher than the first predefined threshold,
transmitting an IS indication; in response to an indication that
the determined radio link quality of each of the plurality of RLM
measurements is lower than the second predefined threshold,
transmitting an OOS indication.
20. The method of claim 19, further comprising at least one of:
upon transmitting consecutive OOS indications, triggering a radio
link failure (RLF) timer, and upon transmitting consecutive IS
indications, stopping a radio link failure (RLF) timer.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit under 35 U.S.C. .sctn.
119(e) of U.S. patent application Ser. No. 62/544,142, filed Aug.
11, 2017, entitled "Method on NR RRM configuration and measurement
based on SS Blocks and CSI-RS," and of U.S. patent application Ser.
No. 62/544,136, filed Aug. 11, 2017, entitled "Method on RLM
Configurations & Procedures," both of which are hereby
incorporated herein by reference in their entirety.
BACKGROUND
[0002] The present application relates generally to methods and
apparatus for mobile communication. In particular, it relates to
configurations and procedures for radio resource management (RRM)
and radio link monitoring (RLM).
[0003] In a wireless communication system, a user equipment (UE)
such as a wireless device may communicate with one or more network
elements to transmit and receive information representing data,
voice and control signals. A wireless communication system may use
RRM techniques to make measurements such as the signal strength of
the serving cell and neighboring cell(s). RLM measurement may be
used to evaluate the radio link failure by measuring the link
quality from the serving cell. During operation, the network
element periodically transmits reference signals that the UE can
measure. When the receiver of the UE is tuned to a frequency of a
first cell and a second cell broadcasting on a different frequency
is available, the network element may schedule measurement gaps
such that the UE can tune its receiver to the frequency of the
second cell in order to perform inter-frequency measurements on the
second cell. In LTE, cells are continuously transmitting
cell-specific reference signals and broadcasting system
information, regardless of the traffic activity in the cell. RRM
can be based on discovery reference signal (DRS). In LTE, DRS
consists of a combination of existing signals, such as
synchronization signal (SS) to assist in obtaining the cell
identity and coarse frequency and time synchronization;
cell-specific reference signals (CRS) to assist in obtaining fine
frequency and time synchronization; and channel state information
(CSI) reference signals (CSI-RS) to determine the transmission
point identity within the cell. The UE is may base cell
identification and RRM measurements such as reference signal
received power (RSRP) and reference signal received quality (RSRQ)
on the DRS. To assist the UE in performing measurements, a timing
configuration may be identified by the UE to provide information on
when and what to measure for each physical-layer cell identity.
SUMMARY
[0004] According to some embodiments, a method of wireless
communication with a user equipment (UE) is provided. The method
comprises identifying a reference signal strength indicator (RSSI)
measurement timing configuration (RMTC); based on the RMTC,
performing a RSSI measurement on at least one downlink (DL) symbol
outside of a synchronization signal (SS) block received from a
first cell.
[0005] According to some embodiments, a method of wireless
communication with a user equipment (UE) for layer-3 mobility is
provided. The method comprises identifying a timing configuration
of channel state information reference signal (CSI-RS); based on
the timing configuration, performing a radio resource management
(RRM) measurement on CSI-RS, wherein the timing configuration
comprises at least one of: a resource configuration indicating a
position of a CSI-RS time or frequency resource within a slot, a
subframe offset, and a slot offset relative to a beginning of
transmission of a synchronization signal (SS) burst.
[0006] According to some embodiments, a method of wireless
communication with a user equipment (UE) is provided. The method
comprises identifying a radio link monitoring (RLM) configuration;
based on the RLM configuration, performing a plurality of RLM
measurements on a reference signal (RS). The RLM configuration
comprises at least one of: a first parameter indicating an
association between the RS and a control channel, and a second
parameter indicating an association between the RS and an
in-sync/out-of-synch (IS/OOS) indication.
BRIEF DESCRIPTION OF DRAWINGS
[0007] Various aspects and embodiments will be described with
reference to the following figures. It should be appreciated that
the figures are not necessarily drawn to scale. In the drawings,
each identical or nearly identical component that is illustrated in
various figures is represented by a like numeral. For purposes of
clarity, not every component may be labeled in every drawing.
[0008] FIG. 1 is a schematic diagram of a mobile communication
system 100 to which disclosures in the present application may be
applied;
[0009] FIG. 2 is a schematic diagram illustrating a transmission
200 received at a UE, according to embodiments of the present
application;
[0010] FIG. 3 is a flow chart of a method 300 of wireless
communication with a UE, in accordance with some embodiments;
[0011] FIG. 4 is a schematic diagram illustrating a transmission
400a received from a serving cell, and a transmission 400b
receiving from a neighboring cell, according to embodiments of the
present application;
[0012] FIG. 5 is a flow chart of a method 500 of wireless
communication with a UE for L3 mobility, in accordance with some
embodiments; and
[0013] FIG. 6 is a flow chart of a method 600 of wireless
communication with a UE, in accordance with some embodiments.
DETAILED DESCRIPTION
[0014] The following is a list of abbreviations that may be found
in the specification and/or the drawings. [0015] 5G-NB 5G Node B
[0016] CORESET Control channel resource set [0017] CRS
Cell-specific Reference Signals [0018] CSI-RS Channel State
Information Reference Signal [0019] DL DownLink [0020] DMRS
DeModulation Reference Signal [0021] gNB gNode B (5G base station)
[0022] HO HandOver [0023] ID Identification [0024] IS In-Synch
[0025] MG Measurement gap [0026] NBR NeighBoRing [0027] NR New
Radio (5G) [0028] NW NetWork [0029] OFDM Orthogonal
frequency-division multiplexing [0030] OOS Out-Of-Synch [0031] PBCH
Physical Broadcast CHannel [0032] QCL Quasi-CoLocated [0033] RACH
Random Access Channel [0034] RF Radio frequency [0035] RLF Radio
Link Failure [0036] RLM Radio Link Monitoring [0037] RRM Radio
Resource Management [0038] RS Reference Signal [0039] RSRP
Reference Signal Received Power [0040] RSRQ Reference Signal
Received Quality [0041] RSSI Received Signal Strength Indication
[0042] SINR Signal-and-Interference-to-Noise-Ratio [0043] SS
Synchronization Signal [0044] SSB SS blocks [0045] SSS Secondary
Synchronization Signal [0046] TDM Time Domain Multiplexing [0047]
UE User Equipment
[0048] Disclosed here are methods and a mobile communication device
that provide configurations and procedures for RRM and RLM, and in
particular, methods and a mobile communication device that provide
RRM and RLM configurations and procedures when using 5G NR
technology.
[0049] In a mobile communication system, a UE such as a mobile
communication device may establish a link with a network element
such as a cellular base station referred to as eNB for LTE, or gNB
for 5G. The UE may communicate with the network element by
transmitting or receiving voice, data and/or control signals. FIG.
1 is a schematic diagram of a mobile communication system 100 to
which disclosures in the present application may be applied. Mobile
communication system 100 includes UE 10 in connection 20 with
network elements 30, in accordance with some embodiments. UE 10 may
be fixed, or mobile, and may be referred to as a mobile
communication device, a mobile device, a user terminal, a wireless
device, a smartphone, or other terminologies. UE 10 has one or more
processors 12 and one or more memories 14. The at least one
memories 14 are configured to store executable instructions or
codes that, when executed by the at least one processors 12, cause
the UE 10 to perform one or more methods as described throughout
the present application. The at least one memories 14 are also
configured to store data to be transmitted to or received from the
network element. The network element 30 is generally a fixed
station and may be a gNB, or an eNB. Network element 30 may be
referred to as a base station, a cellular base station, an access
point, a cell, etc. Although two network elements 30 are shown
connected with the UE 10, it should be appreciated that aspects of
the present application are not limited to the scenarios
illustrated in FIG. 1.
[0050] During operation of a mobile communication system,
synchronization signals may be transmitted within a structure
referred to as an "SS block." An SS block may be composed of one or
more SSs in various arrangements and, in some cases, other signals
such as data symbols may be multiplexed within an SS block. In some
cases, a "burst" of one or multiple SS block may be sent, sometimes
referred to as an SS burst. An SS burst may be of various durations
and SS blocks may or may not be consecutive within a burst and may
or may not be the same. The inventors have recognized and
appreciated that an SS block based RRM measurement timing
configuration (hereinafter referred to as SMTC) may be identified
by the UE to configure measurement window
periodicity/duration/offset information for RRM measurement based
on SS block. In some embodiments, for intra-frequency CONNECTED
mode measurement, up to two measurement window periodicities can be
configured. While in some embodiments, for IDLE mode and
inter-frequency CONNECTED mode measurements, only one SMTC is
configured per frequency band.
[0051] The inventors have recognized and appreciated that when RSSI
measurement is made during an SS block, the measurement may not
properly reflect the cell loading and interference level of data
transmission. For example, in a beamforming scenario, interference
level measured from SSB-RSRQ/SINR would differ from data
transmission, and the cell loading could not be well reflected by
SSB-RSRQ/SINR when measured during an SS block. According to an
aspect of the present application, to solve such problems, RSSI may
be measured from symbols outside of RS symbols, or outside of SS
blocks. In some embodiments, a reference signal strength indicator
(RSSI) measurement timing configuration (RMTC) may be provided. The
UE performs RSSI measurements on DL symbol outside of an SS block
received from a cell, based on the RMTC. The inventors have
recognized and appreciated that measurements based on symbols
outside of SS blocks may accurately reflect data interference
level, and accurately reflect cell loading. Furthermore, measuring
on DL symbols outside of SS blocks may allow UE to measure RSSI
without requiring a wide bandwidth.
[0052] FIG. 2 is a schematic diagram illustrating a transmission
200 received at a UE, according to embodiments of the present
application. According to an aspect of the present application, a
RMTC may configure a RSSI measurements on DL symbol 202c outside of
the SS burst, or DL symbols 202a, 202b inside the SS burst, but
still outside of SS blocks.
[0053] The RMTC may be provided by a broadcasting cell, and may be
signaled by higher layers in the UE for identification by the UE.
In some embodiments, the UE may measure RSSI by averaging RSSI
measurement over the DL symbol specified in the RMTC. In dynamic
beamforming scenarios on the control and data channels, UE may
derive a cell-level RSSI by averaging received power over DL
symbols of measurement subframes. The UE may also derive beam-level
RSSI associated with a beam of a plurality of beams by averaging
received power over one or more QCLed OFDM symbols that are QCLed
to the beam of the plurality of beams.
[0054] According to an aspect of the present application, the time
location (subframes or slots) of a beginning of a RSSI measurement
can be either selected by UE or indicated by higher layers through
the RMTC. In some embodiments, the RMTC could be configured
together with SSB Measurement Timing Configuration (SMTC). In some
embodiments, the RMTC may include at least all or part of the
following: the periodicity of RSSI measurement; the timing offset
of RSSI symbols, which can be configured in the unit of symbols,
slots, or subframes; the duration of RSSI measurement, which can be
configured in the unit of symbols of the SSB in the measured
frequency range, considering the subcarriers spacing could be
different in different frequency range. The RMTC may also include,
for one RSSI measurement, multiple timing offset and duration of
one RSSI measurement.
[0055] In some embodiments, when the measurement gap is configured,
UE will not perform inter-frequency measurement on the symbols
configured by RSSI outside the measurement gap.
[0056] FIG. 3 is a flow chart of a method 300 of wireless
communication with a UE, in accordance with some embodiments. As
shown in FIG. 3, at act 302, method 300 comprises identifying a
reference signal strength indicator (RSSI) measurement timing
configuration (RMTC). At act 304, method 300 comprises based on the
RMTC, performing a RSSI measurement on at least one downlink (DL)
symbol outside of a synchronization signal (SS) block received from
a first cell. Optionally and in inter-frequency measurements, at
act 306, method 300 comprises determining a beginning of a
measurement gap (MG) associated with a transmission from the first
cell. At act 308, method 300 may optionally comprise identifying a
synchronization signal block (SSB) measurement timing configuration
(SMTC) comprising an SMTC measurement window timing offset; and
beginning an SSB measurement on an SSB received from a second cell
at a time offset from the beginning of the MG by an MG timing
refinement offset. At act 310, method 300 may optionally comprise
completing a radio frequency (RF) tuning of the UE from the first
frequency to the second frequency by the time offset from the
beginning of the MG by the MG timing refinement offset.
[0057] Aspects of the present application are related to a method
for inter-frequency SSB measurement. FIG. 4 is a schematic diagram
illustrating a transmission 400a received from a serving cell, and
a transmission 400b receiving from a neighboring cell, according to
embodiments of the present application. In FIG. 3, the serving cell
has a frequency that is different from a frequency of the
neighboring cell (NBR cell). The inventors have recognized and
appreciated that for inter-frequency measurement, UE need a time
gap for RF tuning. For example as shown in FIG. 3, if the beginning
of measurement gap 404 in the serving cell and the beginning of SS
burst 406 in a neighboring cell are aligned on the time axis, UE
will miss some SS blocks due to the time needed to perform RF
tuning. According to an aspect of the present application, an
indication for a MG timing refinement offset, such as offset 402 as
illustrated in FIG. 1, may be provided in a timing configuration to
introduce a short offset between the beginning of the measurement
gap pattern in the serving cell and the SS burst transmission in
the NBR cell, to allow UE to perform RF tuning. In some
embodiments, the MG timing refinement offset may be configured in
the unit of a scheduling unit. In one non-limiting example, the MG
timing refinement offset may be configured in the unit of a slot, a
unit of half of a slot, or a unit of multiple symbols. In some
embodiments, the MG timing refinement offset may have a time value
of less than 1 ms, less than 0.5 ms, between 0 and 1 ms, between 0
and 0.5 ms, or between 0.25 and 0.75 ms. For example, a 0.25 ms,
0.5 ms, or 0.75 ms MG timing refinement offset may be provided.
[0058] In some embodiments, a scheduling unit such as a slot is
divided into two parts. The forepart of a slot may be configured
for a gNB to schedule data transmission. The behind part of a slot
may be configured for a gNB to transmit SS blocks. A MG timing
refinement offset indication may be configured in SMTC to indicate
the timing of one or both parts of the slot.
[0059] In some embodiments, UE is configured to perform
inter-frequency measuring on SS blocks with regarding to the SMTC
and the configured indication of MG timing offset. Specifically,
the UE is configured to tune RF of one or more of its receivers
into the frequency after the configured MG timing refinement
offset, and to complete RF tuning before the particular time that
is offset from the beginning of the MG by the MG timing refinement
offset.
[0060] Aspects of the present application are related to a method
to provide timing configuration of CSI-RS for layer-3 (L3)
mobility. The inventors have recognized and appreciated that in
CSI-RS for L3 mobility, the UE may need SS block to provide cell
detection and course synchronization of the timing and frequency in
order to measure CSI-RS. The UE may also need SS block to provide
TTI reference in order to measure CSI-RS. Furthermore, for an
inter-frequency measurement, UE may need a time index to know the
timing of CSI-RS. It may also need frame timing. According to an
aspect of the present application, to solve these needs, a timing
configuration of CSI-RS for L3 mobility may help perform CSI-RS
measurement without knowing the frame timing of other frequency
band.
[0061] In one embodiment, a timing offset of CSI-RS may be
configured as subframe and slot offset. The CSI-RS time/frequency
resource within a slot can be further configured by resource
configuration. In such an embodiment, UE may need to know the frame
timing to perform CSI-RS measurement. However, in an
inter-frequency measurement, UE may not know the frame timing of
the cells at other frequency range.
[0062] In another embodiment, a timing offset of CSI-RS may be
configured as the slot offset to the associated SS block. The
CSI-RS time/frequency resource within a slot can be further
configured by resource configuration. In this embodiment, it should
be appreciated that the frame timing may not be necessary to be
known by UE, while UE may need to know the time index of SS block
to perform CSI-RS measurement based on the associated SS block.
However, for some deployments, e.g. multi-TRP cell, the CSI-RS may
not be associated to certain SS block.
[0063] In yet another embodiment, a timing offset of CSI-RS may be
configured as the slot offset to the beginning of SS burst
transmission. The CSI-RS time/frequency resource within a slot can
be further configured by resource configuration. In this
embodiment, UE may need to know the time index of SS block to
derive the beginning of SS burst transmission, and UE is able to
perform measurement on CSI-RS based on the configured offset.
[0064] According to an aspect of the present application, a timing
configuration of CSI-RS for L3 mobility may be provided. The timing
configuration may include at least all or part of the following:
[0065] resource configuration, which configures the CSI-RS
time/frequency resource within a slot, and [0066] configurable
subframe offset and slot offset, or [0067] configurable slot offset
to the associated SS block, or [0068] configurable slot offset to
the beginning of SS burst transmission
[0069] Further according to the aspect of the present application,
UE may perform RRM measurement on CSI-RS with the following
procedure: [0070] Step 1. UE performs cell detection and course
synchronization of the timing and frequency on SS blocks. UE
obtains the cell ID after this step; [0071] Step 2. UE derived the
time index of the detected SS blocks. If the association between
CSI-RS and SS block is configured, the UE derives the time index of
detected SS blocks, which is associated to the configured CSI-RS;
[0072] Step 3. UE derived the timing reference based one the time
index. The timing reference can be frame or slot timing derived by
time index of detected SS block; [0073] Step 4. UE perform the RRM
measurement regarding the timing reference and the timing
configuration.
[0074] FIG. 5 is a flow chart of a method 500 of wireless
communication with a UE for L3 mobility, in accordance with some
embodiments. As shown in FIG. 5, at act 502, method 500 comprises
identifying a timing configuration of channel state information
reference signal (CSI-RS). At act 504, method 500 comprises based
on the timing configuration, performing a radio resource management
(RRM) measurement on CSI-RS. Optionally at act 506, method 500
further comprises performing cell detection to identify a cell
identification (ID); performing course synchronization to identify
a timing and frequency on SS blocks. At act 508, method 500 may
optionally comprise determining a time index of SS blocks that is
associated to the CSI-RS; and determining a timing reference based
on the time index.
[0075] Aspects of the present application are related to a method
on RLM configurations and procedures. The inventors have recognized
and appreciated that a RLM configuration may be provided that
includes at least all or part of the following: [0076] a
configurable power/energy/beamforming/precoding gain offset. The
offset may capture the precoding mismatch between control channel
and RLM RS. The offset may also capture the beamforming mismatch
between different type of RLM RS (e.g. SS block (Common Control)
and CSI-RS (Dedicated Control)). [0077] a configurable RS type,
e.g. SS block or CSI-RS [0078] a configurable association between
configured RS and control channel, including at least all or part
of: spatial QCL or QCL assumption, CONRESET identification [0079] a
configurable association between configured RS and IS/OOS
indication. In some embodiments, two sets of RSs may be used for IS
and OOS indication derivation, respectively.
[0080] In some embodiments, the control channel can be a dedicated
control channel, common control channel, group common control
channel.
[0081] In some embodiments, two CSI-RS for RLM may be configured
for UE. One (CSI-RS#1) for IS, the other (CSI-RS#2) for OSS. In
such embodiments, a configurable power/energy/beamforming/precoding
gain offset may be configured in RLM configuration. In one
non-limiting example, for CSI-RS#1, an offset of 3 dB is provided
for IS indication, an offset of 2 dB is provided for OSS
indication, while for CSI-RS#2, an offset of -2 dB is provided for
IS indication, an offset of -3 dB is provided for OSS indication.
It should be appreciated that the above offset values are provided
for illustration purpose only and aspects of the present
application are not limited to such values.
[0082] In some embodiments, UE may derive the radio quality of
CSI-RS#1 and CSI-RS#2 based on the measured SINR and offset for
IS/OOS respectively. In one non-limiting example, for CSI-RS#1:
measured SINR=10 dB, derived radio quality for IS=10 dB+3 dB=13 dB,
derived radio quality for OOS=10 dB+2 dB=12 dB. For CSI-RS#2:
measured SINR=6 dB , derived radio quality for IS=6 dB+-3 dB=4 dB,
derived radio quality for OOS=6 dB-3 dB=3 dB. It should be
appreciated that the above values are provided for illustration
purpose only and aspects of the present application are not limited
to such values.
[0083] In some embodiments, if all the derived radio quality on the
CSI-RS are worse than the predefined threshold (Q.sub.OUT), an OOS
indication is sent. In one non-limiting example, if Qout=12.5 dB,
the OOS is sent by UE since derived radio quality of all CSI-RSs
for OOS are (12 dB, 3 dB) M 12.5 dB. If one of the derived radio
quality on the CSI-RS is better than the predefined threshold
(Q.sub.in), an IN indication is sent. In one non-limiting example,
if Qin=12.5 dB, the IS is sent by UE since derived radio quality of
CSI-RS#1 for IS is 13 dB>12.5 dB.
[0084] FIG. 6 is a flow chart of a method 600 of wireless
communication with a UE, in accordance with some embodiments. As
shown in FIG. 6, at act 602, method 600 comprises identifying a
radio link monitoring (RLM) configuration; and based on the RLM
configuration, performing a plurality of RLM measurements on a
reference signal (RS). At act 604, method 600 comprises determining
a radio link quality based on the plurality of RLM measurements. At
act 606, method 600 comprises comparing the determined radio link
quality with a first predefined threshold for deriving IS
indication, and comparing the determined radio link quality with a
second predefined threshold for deriving OOS indication. At act
607, if the determined radio link quality of one of the plurality
of RLM measurements is higher than the first predefined threshold,
the method at act 608 transmits an IS indication. At act 609, if
the determined radio link quality of each of the plurality of RLM
measurements is lower than the predefined threshold, the method at
act 610 transmits an OOS indication. At act 612, method 600 may
optionally comprise stopping a radio link failure (RLF) timer. At
act 614, method 600 may optionally comprise triggering a radio link
failure (RLF) timer.
[0085] Having thus described several aspects of at least one
embodiment of this invention, it is to be appreciated that various
alterations, modifications, and improvements will readily occur to
those skilled in the art.
[0086] Such alterations, modifications, and improvements are
intended to be part of this disclosure, and are intended to be
within the spirit and scope of the invention. Further, though
advantages of the present invention are indicated, it should be
appreciated that not every embodiment of the technology described
herein will include every described advantage. Some embodiments may
not implement any features described as advantageous herein and in
some instances one or more of the described features may be
implemented to achieve further embodiments. Accordingly, the
foregoing description and drawings are by way of example only.
[0087] Various aspects of the present invention may be used alone,
in combination, or in a variety of arrangements not specifically
discussed in the embodiments described in the foregoing and is
therefore not limited in its application to the details and
arrangement of components set forth in the foregoing description or
illustrated in the drawings. For example, aspects described in one
embodiment may be combined in any manner with aspects described in
other embodiments.
[0088] Also, the invention may be embodied as a method, of which an
example has been provided. The acts performed as part of the method
may be ordered in any suitable way. Accordingly, embodiments may be
constructed in which acts are performed in an order different than
illustrated, which may include performing some acts simultaneously,
even though shown as sequential acts in illustrative
embodiments.
[0089] Such alterations, modifications, and improvements are
intended to be part of this disclosure, and are intended to be
within the spirit and scope of the invention. Further, though
advantages of the present invention are indicated, it should be
appreciated that not every embodiment of the invention will include
every described advantage. Some embodiments may not implement any
features described as advantageous herein and in some instances.
Accordingly, the foregoing description and drawings are by way of
example only.
[0090] Use of ordinal terms such as "first," "second," "third,"
etc., in the claims to modify a claim element does not by itself
connote any priority, precedence, or order of one claim element
over another or the temporal order in which acts of a method are
performed, but are used merely as labels to distinguish one claim
element having a certain name from another element having a same
name (but for use of the ordinal term) to distinguish the claim
elements.
[0091] Also, the phraseology and terminology used herein is for the
purpose of description and should not be regarded as limiting. The
use of "including," "comprising," or "having," "containing,"
"involving," and variations thereof herein, is meant to encompass
the items listed thereafter and equivalents thereof as well as
additional items.
* * * * *